Bridges, tunnels, and other instrumentalities of transportation and communication (excluding buildings and improvements, furniture, furnishings, fixed contents, and supplies held in storage) may be covered by marine, inland marine, and transportation policies. This category includes:
(1) bridges, tunnels, and other similar instrumentalities, including auxiliary facilities and equipment attendant thereto;
(2) piers, wharves, docks, slips, drydocks, and marine railways;
(3) pipelines, including on-line propulsion, regulating, and other equipment appurtenant to such pipelines but excluding all property at manufacturing, producing, refining, converting, treating, or conditioning plants;
(4) power transmission, telephone, and telegraph lines, excluding all property at generating, converting, or transforming stations, substations, and exchanges;
(5) radio and television communication equipment in use as such, including towers and antennas with auxiliary equipment, and appurtenant electrical operating and control apparatus; and
(6) outdoor cranes, loading bridges, and similar equipment used to load, unload, and transport.